/Engine/Source/Runtime/UMG/Public/Blueprint/WidgetTree.h
Finds a widget in the tree using the native widget as the key.
[UWidget](API\Runtime\UMG\Components\UWidget) * FindWidget ( [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > InWidget ) const